i doubt it's for a bunker but it's kind of interesting to think about. i think if you have a ton of money, why not build a bunker? you don't have to believe that you'll need it. if the money isn't an issue, it's better to have it and not need it than the opposite, and plenty of non-rich people do the same at a smaller scale too.

if i had that much money i'd have all sorts of contingencies for myself and my family/friends all over the world. like, why not?